Sewing-machine.



0. F. HANSEN. 7

SEWING MACHINE. APPL'lcmo'n FILED mum. 1902.

' 1,134,528.. I Patent edApnfi, 1915.

STATES PATENT FEICE.

DSGAB F. HANSEN, OF CHICAGO, ILLINOIS, ASSIGNOB T0 UNION SPECIAL MACHINEGG'MPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

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Application filed May 14, 1907.

for its object to provlde a device or devices for protecting the need-eloops so that the needle on its descent, will not enter its own loop.

The improvement is more especially adapted for use in connection withoverseaming machines wherein a thread carrying looper enters the needleloop and a second thread carrying looper enters the loop of the firstlooper and moves to a position above the material for the needle toenter its loop. In this character of stitching mechanism, the needleloop is loose when the looper is being retracted therefrom and sometimes said needle loop, instead of being shed from the looper, will becarried back with said looper and the needle on its next descent, will.enter its own previously formed loop, thus forming imperfect stitches.Wipers have been used to engage the needle loop upon the looper to causeit to be shed with certainty from the looper as shown in the applicationof Lansing Onderdonk, Serial No. 218,192, filed July 6, 1904. Thisinvention is an improvement upon the construction shown and described insaid application.

The invention consists in a device arranged relative to the needle sothat the point of said needle is housed, or protected, as it passes theprevious formed needle loops.

The invention consists further in a device for supporting the throatplate at a point adjacent to the needle slot.

The invention consists still further in the parts and arrangementshereinafter shown and described and set forth in the claims.

In the drawings, which show an embodiment of my invention, Figure 1 is adetail view showing the relation of the improved thread guard or loopprotector to the needle Specification of Letters Patent.

Patented Apr. 6, 1915.

Serial No. 373,536.

and loopers. Fig. 2 is a sectional view showing the bed plate, the worksupport, the needle and the thread guard. Fig. 3 is a detail viewshowing the thread guard and its supporting arm in side elevation. Fig.l is a top plan view showing the thread guard and its supporting column.Fig. 5 isa detail sectional view showing the thread guard, the needleand the looper.

The bed plate 1, the work plate 2, the overhanging arm, the needle 3,carried by the needle bar reciprocating in the overhanging arm, are ofthe usual construction. Cooperating with said needle 3, is a threadcarrying looper 4, which is pivoted beneath the work support and hassuitable mechanism for giving thereto its oscillations. 00- operatingwith said looper at and needle 3, is a second thread carrying looper 5.Said needle and loopers are so arranged and timed that the needle, afterpassing through the work support, rises throwing out its loop, which isthen entered by the thread carrying looper 4L and the thread carryinglooper 5 passes through the loop of thread carried by the looper 4i andmoves to a position above the work support for the needle on the nextdownward stroke to enter its loop. These parts in the manner ofoperation are of the usual construction and form no part of the presentinvention. Said machine is preferably provided with a trimming mechanismcomprising an upper movable trimming member and a lower stationarymember 6. Said stationary trimming member 6 is supported by anadjustable block 7. Rising from the bed plate 1, is a post 8, whichengagesthe stationary trimmer support adjacent its forward end andserves to support said trimming member against the downward thrust ofthe cutting action of the movable trimming member.

In a stitch forming mechanism of the character above described, as thelooper 4L recedes, the needleloop is free from strain and hangs looselyabout said looper and therefore it often occurs that said needle loop isnot properly shed from the looper, but is carried back into the path ofthe needle so that in its next descent, said needle will enter its ownpreviously formed needle loop and thus form imperfect stitches.

The present invention relates to a thread 9, which is located directlybeneath tae i ork support 2 and has a ilat head 10 provided with agroove 11, which partially encircles the needle after said needle passesthrough the work support. Said thread guard 9 is screwed to a collar 12by means of a screw 13. The shank of the thread guard 9 is slotted as atll, so that said thrcad guard may be adjusted across the end of thecollar 12, which supports the same. Said collar 12 is provided with alongitudinal bore, whereby said collar may be placed on he post 8, whichsupports the lower trimming member. It is obvious, howe er, that saidcollar or thread guard 9 may be supported in any other suitable manner.The collar 12 is provided with split wings 15 and a set screw 16,whereby said collar may be clamped to the post 8. Said collar is alsoprovided with a set screw 17, which passes through said collar andengages the post 8.

It will be noted from the above description that the thread guard 9 maybe adjusted angularly about the post 8 and the thread guard may also beadjusted vertically upon said post and transversely of its supportingcollar. By these adjustments, the thread guard 9 may be brought upagainst the work support so as to form a support for the throat plate ata point adjacent the needle hole.

In order to adjust the collar 12 angularly, upon the supporting post 8,the set screws 16 and 17 are loosened. The collar is properlypositioned, then the set screw 17 is tightened in order to hold thecollar in place, after which the screw 16 is set, which tightly clampsthe collar in its adjusted position. The screw 1'7 prevents angularmovement of the collar due to pressure on the screw 16 when setting thesame.

The operation of the device will be obvious from the above description.The needle enters the material, passes beneath the work support andrises to throw out its loop. The looper 4: passes through the loop andits loop is in turn engaged by the looper 5. The needle rises anddescends again for the next succeeding stitch and the looper 4; recedes.If the loop of needle thread carried by the looper 4: is not properlyshed, but is drawn back by said looper to a position ad jacent theneedle, as shown in Fig. 5, the needle in its descent will not engagesaid loop of thread for the reason that the needle point is housedwithin the groove 11 in the thread guard 9 and the thread is thereforeprotected from said needle. The thread guard 9 which partly houses theneedle is also located close to the path of movement of the looper.Therefore, when the looper is retracted the needle loop carried therebywill be brought against the edge of this needle guard and forciblystripped or shed from the looper. The thread guard 9 serves as a meansfor supporting the throat plate at a point adjacent the needle, as abovenoted. The thread guard will also further act as a means for guardingthe needle thus properly positioning the needle for cooperation with thelooper and also serve to cause the needle to throw out its loop on theproper side for the entrance of the looper.

It will be obvious that minor changes in the location of parts anddetails of construction may be made without departing from the spirit ofmy invention.

Having thus particularly described my 111- vention what I claim as newand desire to secure by Letters Patent, is;

1. A sewing machine including in combination a work support, a needle, athreaded looper coiiperating with the needle beneath the work support, athread-engaging implement cooperating with the looper and with theneedle above the work support, and means for housing the needle pointbeneath the work support while passing the threader looper, said meansalso serving to insure the shedding of the needle loop from the looper.

2. A sewing machine including in combination a work support, a needle, athreaded looper cotiperating with said needle beneath the work support,a thread-engaging implement coiiperating with said threaded looper, andwith the needle above the work support, and a thread guard locatedbeneath the work support and having a groove in line with the needlehole whereby said guard partially encircles said needle and protects thepoint of the needle from engaging the needle loop on the looper whilethe needle point is passing the looper, said guard also serving toinsure the shedding of the needle from the looper.

8. A sewing machine including in combination a work support, a needle, athreaded looper cooperating with said needle beneath the work support, athreaded looper adapted to enter the loop of the first named looperthread and cotiperating with the needle above the work support, andmeans for housing the needle point beneath the work support whilepassing the threaded looper.

a A sewing machine including in combination a work support, a needle, alooper cooperating therewith, a supporting memher, a thread guardadjustably mounted on said supporting member and means for verticallyadjusting said supporting member.

5. A sewing machine including in combination a bed plate, a worksupport, a supporting member carried by said bed-plate and a threadguard carried by said supporting member and engaging the work support ata point adjacent the needle opening.

6. A sewing machine including in combination a bed plate, a worksupport, a supporting member carried by the bed plate, a thread guardadjustably mounted on said member and engaging said work support at apoint adjacent said needle hole.

7 A sewing machine including in combination a bed plate, a work support,a trimming mechanism having a stationary trimming member, a post carriedby the bed plate and engaging the free end of said stationary member, aneedle, a looper cooperating therewith, a thread guard adjustablymounted upon said post and having a groove to protect the point of saidneedle, said thread guard engaging the work support at a point adjacentto the needle.

8. A sewing machine including in combination a bed plate, a worksupport, a needle, and means carried by the bed plate and extendingupwardly therefrom and engaging the work support at a point adjacent theneedle opening therein, said means being so positioned and constructedas to guar the needle.

9. A sewing machine including in combination, a work support, a bedplate, means for supporting the work support at a point adjacent theneedle opening from the bed plate, and a needle guard and threadprotector carried by said supporting means.

10. A sewing machine including in combination a work support, a needle,a looper Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents,

cooperating therewith, a supporting member, a thread guard adjustablymounted upon said supporting member and means for vertically adjustingand angularly adjusting said supporting member.

11. A sewing machine including in combination a work support, a needle,a looper cooperating therewith, a thread guard having a fiat head and agroove therein for said needle and means for adjusting the angle of saidfiat head relative to said needle and looper.

12. A sewing machine including in combination, a work support, a needle,a threaded looper cooperating therewith beneath the work support, meanscooperating with the threaded looper and with the needle above the worksupport, and means located beneath the work support for housing theneedle point after the same passes below the work support, until afterit has passed the looper, whereby the point of the needle is preventedfrom entering between the thread of the looper and the body thereof.

In testimony whereof I afiiX my signature, in presence of two witnesses.

OSCAR F. HANSEN.

Witnesses EUGENE G. MASON, WARD E. WRIGHT.

Washington, D. G."

